Rare glass table lamp L423 by Michael Red for Vistosi, 1970

Very rare table lamp in black-purple mouth blown glass by Vistosi, 1970. Designed by Michael Red. Model L423.
 
The glass appears to be black but when switched on it shows purple around the bulb. Amazing quality in both design and quality.
 
In perfect condition. No chips or scratches!
Cleaned and checked. In full working order. E27 bulb and switch in the cord.
 
It oozes elegance and quality!
 
Height: 26cm
Diameter: 18cm